WAC 296-54-54730
Rigging -- Shackles. (1) Shackles used
to hang blocks, jacks, or rigging on spars, must have the pins
secured with a nut and cotter key or a nut and molle.
(2) Flush pin, straight-sided shackles must be used for
mainline, slackline and skyline extensions.
(3) Shackles with screw pins, knockout or slip pins may
be used to anchor skylines, slackline, guyline, and/or guyline
extensions.
(4) All other shackles must be screw pin type or have the
pin secured with a nut and cotter key or a nut and molle,
except as specified elsewhere for specific purposes.
(5) The opening between the jaws of shackles used to hang
blocks, jacks, and rigging and to join or attach lines, must
be a maximum of one inch greater than the size of the rope,
swivel, or shackle to which it is attached.
(6) All shackles must be one size larger than the lines
they connect and made of forged steel or material of
equivalent strength.
(7) Shackles used to join lines must be hung with the pin
and "U" part of the shackle through the eyes of the lines.
